White light emitting device and display device using the same

ABSTRACT

A white light emitting device, including a circuit board; a plurality of light sources mounted on the circuit board, each light source of the plurality of light sources configured to emit monochromatic light; a light converter spaced apart from the circuit board, the light converter configured to convert the monochromatic light emitted from the light sources to white light; and a compensator provided between the circuit board and the light converter, the compensator configured to convert the emitted monochromatic light to white light.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. application Ser. No.16/723,520, filed on Dec. 20, 2019, which is a continuation of U.S.application Ser. No. 14/958,453, filed on Dec. 3, 2015, issued as U.S.Pat. No. 10,545,375 on Jan. 28, 2020, which claims priority from KoreanPatent Application No. 10-2014-0171973, filed on Dec. 3, 2014, andKorean Patent Application No. 10-2015-0092852, filed on Jun. 30, 2015,in the Korean Intellectual Property Office, the disclosures of which areincorporated herein by reference in their entireties.

BACKGROUND 1. Field

Exemplary embodiments relate to a white light emitting device whichemits white light using a light source which emits a monochromatic lightand a display panel including the same.

2. Description of the Related Art

Light emitting devices such as light emitting diodes (LEDs) are opticalsemiconductor devices which emit light by recombination of minoritycarriers (electrons or holes). Light generated by the recombination ofthe minority carriers is a monochromatic light having a certain range ofa wavelength.

Methods of generating white light include using a plurality of lightemitting devices emitting a variety of the monochromatic light havingcomplementary colors, and a using one light emitting device and aphosphor having a complementary color of the monochromatic light emittedby the light emitting device.

When white light is synthesized using a plurality of light emittingdevices, a color reproduction range may be widened. However, becauseelectrical characteristics of each of the light emitting devices may bedifferent from each other, driving circuits become complex, and becausethe characteristic change of the light emitting devices according tousages are different from each other, color uniformity may not beensured.

In addition, when white light is synthesized using one light emittingdevice and a phosphor, driving circuits may be simplified. However,color uniformity cannot be ensured due to reflection, refraction, or thelike of the monochromatic light.

SUMMARY

Therefore, it is an aspect of the exemplary embodiments to provide awhite light emitting device having improved color uniformity and adisplay panel using the same.

Additional aspects of the exemplary embodiments will be set forth inpart in the description which follows and, in part, will be obvious fromthe description, or may be learned by practice of the exemplaryembodiments.

According to an aspect of an exemplary embodiment, a white lightemitting device includes a circuit board; a plurality of light sourcesmounted on the circuit board, each light source of the plurality oflight sources configured to emit monochromatic light; a light converterspaced apart from the circuit board, the light converter configured toconvert the monochromatic light emitted from the light sources to whitelight; and a compensator provided between the circuit board and thelight converter, the compensator configured to convert the emittedmonochromatic light to white light.

The compensator may include a plurality of phosphor members formed of aphosphor having a color that is complementary to a color of the emittedmonochromatic light.

The plurality of phosphor members may be disposed between the pluralityof light sources.

At least one phosphor member of the plurality of phosphor members may bedisposed inside at least one light source of the plurality of lightsources.

The at least one light source may include a light emitting devicepackage configured to generate a monochromatic light; and a lensconfigured to accommodate the light emitting device package and emit themonochromatic light, and the at least one phosphor member may bedisposed between the light emitting device package and the lens andconvert a monochromatic light reflected inside of the at least one lightsource to white light.

An arrangement pattern of the plurality of phosphor members may bedetermined according to a pattern of a color mura of the white lightemitted from the light converter.

The plurality of phosphor members may include a first group of phosphormembers disposed on an edge of the circuit board, and a second group ofphosphor members disposed at a center of the circuit board, and thefirst group may be more densely arranged than the second group.

A size of the phosphor members may be determined according to a level ofa color mura of white light converted from the light converter.

The plurality of phosphor members may include a first phosphor memberhaving first size and located on an edge of the circuit board and asecond phosphor member having a second size and located on a center ofthe circuit board, and the first size may be greater than the secondsize.

The white light emitting device may include a coated layer stacked onthe compensator.

The white light emitting device may include a reflector including aplurality of openings corresponding to the plurality of light sources,stacked on the circuit board, and reflecting the monochromatic lighttoward the light converter.

According to another aspect of an exemplary embodiment, a white lightemitting device includes a circuit board; a plurality of light sourcesmounted on the circuit board, each light source of the plurality oflight sources configured to emit blue light; a light converter spacedapart from the circuit board, the light converter configured to convertthe blue light emitted from the light sources to white light; areflective sheet stacked on the circuit board, the reflective sheetconfigured to reflect the blue light toward the light converter; and acompensator provided between the circuit board and the reflective sheet,the compensator configured to convert the blue light to white light.

The compensator may include a plurality of phosphor members having ayellow phosphor.

The plurality of phosphor members may be arranged between the pluralityof light sources.

An arrangement pattern of the plurality of phosphor members may bedetermined according to a pattern of a color mura of the white lightconverted from the light converter.

The plurality of phosphor members may include a first group of phosphormembers disposed on an edge of the circuit board, and a second group ofphosphor members disposed at a center of the circuit board, and thefirst group may be more densely arranged than the second group.

The plurality of phosphor members may be directly printed and formed onthe reflective sheet.

At least one light source of the plurality of light sources may includea light emitting device package configured to generate blue light; and alens configured to emit the blue light generated from the light emittingdevice package, and the plurality of phosphor members are disposedbetween the lens and the light emitting device package.

The compensator may be formed of at least one from among a sheet or filmhaving the plurality of phosphor members, and the compensator may bebonded to the reflective sheet.

The compensator may be formed by depositing the plurality of phosphormembers on the reflective sheet.

The compensator may be formed by bonding the plurality of phosphormembers to the reflective sheet.

According to a further aspect of an exemplary embodiment, a displaydevice includes a liquid crystal panel; a light guide plate provided ina rear of the liquid crystal panel; and a white light emitting deviceprovided in a rear of the light guide plate the white light emittingdevice configured to emit white light onto the light guide plate,wherein the white light emitting device includes: a circuit board; aplurality of light sources mounted on the circuit board, each lightsource of the plurality of light sources configured to emit amonochromatic light; a light converter spaced apart from the circuitboard, the light converter configured to convert the monochromatic lightincident from the light sources to white light; and a compensatorprovided between the circuit board and the light converter, thecompensator configured to convert the incident monochromatic light towhite light.

According to a still further aspect of an exemplary embodiment, a whitelight emitting device includes a circuit board; a light source mountedon the circuit board, the light source configured to emit amonochromatic light; a light converter configured to convert the emittedmonochromatic light to white light; and a compensator provided betweenthe circuit board and the light converter, wherein a portion of theemitted monochromatic light is reflected by at least one from among thelight converter or the circuit board, and the compensator may beconfigured to convert the reflected monochromatic light to white light.

The compensator may include a plurality of phosphor members formed of aphosphor having a color that is complementary to a color of thereflected monochromatic light.

The plurality of phosphor members may be disposed on the circuit boardadjacent to the light source.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the exemplary embodiments will becomeapparent and more readily appreciated from the following description,taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic exploded perspective view of a white lightemitting device in accordance with an exemplary embodiment;

FIG. 2 is a cross-sectional view of a light source of a white lightemitting device in accordance with an exemplary embodiment;

FIG. 3 is a view for describing an exemplary embodiment of a lightemitting device which emits a monochromatic light;

FIG. 4 is a cross-sectional view of a white light emitting device inaccordance with an exemplary embodiment;

FIG. 5 is a cross-sectional view of a white light emitting device inaccordance with another exemplary embodiment;

FIG. 6 is a cross-sectional view of a white light emitting device inaccordance with still another exemplary embodiment;

FIG. 7 is a view for describing an arrangement pattern of phosphormembers according to one exemplary embodiment;

FIG. 8 is a view for describing an arrangement pattern of phosphormembers according to another exemplary embodiment;

FIG. 9 is a view for describing an arrangement pattern of phosphormembers according to still another exemplary embodiment;

FIG. 10 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment;

FIG. 11 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment;

FIG. 12 is a view for describing a pattern of a color mura of a whitelight emitting device in accordance with one exemplary embodiment;

FIG. 13 is a view for describing an arrangement pattern of phosphormembers on an edge of the white light emitting device in accordance withone exemplary embodiment;

FIG. 14 is a view for describing an arrangement pattern of phosphormembers on an edge of the white light emitting device in accordance withanother exemplary embodiment;

FIG. 15 is a cross-sectional view for describing an arrangement positionchange of phosphor members of a white light emitting device inaccordance with one exemplary embodiment;

FIG. 16 is a cross-sectional view for describing an arrangement positionchange of phosphor members of a white light emitting device inaccordance with another exemplary embodiment;

FIG. 17 is a cross-sectional view for describing an arrangement positionchange of phosphor members of a white light emitting device inaccordance with still another exemplary embodiment;

FIG. 18 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment;

FIG. 19 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment;

FIG. 20 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment;

FIG. 21 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment;

FIG. 22 is an exploded perspective view of a display device inaccordance with one exemplary embodiment;

FIG. 23 is an exploded perspective view of a display device inaccordance with another exemplary embodiment;

FIG. 24 is a schematic exploded perspective view of a white lightemitting device including a plurality of light source module;

FIG. 25 is a schematic perspective view for describing a light sourcemodule;

FIG. 26 is a cross-sectional view of a white light emitting device;

FIG. 27 is a cross-sectional view of a white light emitting device whichfurther includes a coated layer;

FIG. 28 is an exploded perspective view of a white light emitting devicewhich further includes a reflector; and

FIG. 29 is a cross-sectional view of a white light emitting device whichfurther includes a reflector.

DETAILED DESCRIPTION

Advantages and features of the exemplary embodiments and methods ofachieving the same will be clearly understood with reference to theaccompanying drawings and the following detailed description. Howeverthe description is not limited to the exemplary embodiments to bedisclosed, but may be implemented in various different forms. Theexemplary embodiments are not intended to modify the scope as defined bythe appended claims. Hereinafter, the exemplary embodiments will bedescribed in detail with reference to accompanying views.

Reference will now be made in detail to the exemplary embodiments,examples of which are illustrated in the accompanying drawings, whereinlike reference numerals generally refer to like elements throughout.

FIG. 1 is a schematic exploded perspective view of a white lightemitting device in accordance with one exemplary embodiment.

Referring to FIG. 1 , a white light emitting device 100 in accordancewith one exemplary embodiment may include a circuit board 110, aplurality of light sources 120 which are mounted on the circuit board110 and emit a variety of monochromatic light (ML), a light converter130 which converts the monochromatic light to white light, and acompensator 140 which is provided between the plurality of light sources120 and reduces a color mura.

The monochromatic light having a wavelength in a certain range visuallyappears as one color. For example, the monochromatic light may have onecolor from among blue light, red light, and green light.

The plurality of light sources 120 are mounted on the circuit board 110.An electrode pattern or a circuit pattern may be formed on the circuitboard 110, the light sources 120 and the circuit board 110 may beelectrically connected by a wire bonding or flip chip bonding method,etc. The circuit board 110 may be implemented by a printed circuit board110, but it may also be implemented by a flexible circuit board 110(flexible copper clad laminate) according to necessity.

FIG. 2 is a cross-sectional view of a light source 120 of a white lightemitting device 100 in accordance with one exemplary embodiment. FIG. 3is a view for describing one exemplary embodiment of a light emittingdevice 121 a which emits a monochromatic light.

As shown in FIG. 2 , a light source 120 may be provided as a packagetype and mounted on a circuit board 110. The light source 120 generatesand emits a monochromatic light. Specifically, the light source 120includes a light emitting device package 121 which generates themonochromatic light and a lens 122 which emits the monochromatic light.

The light emitting device package 121 includes the light emitting device121 a which emits the monochromatic light and a body 121 b in which thelight emitting device 121 a is accommodated. The light emitting device121 a may be a light emitting diode (LED). Hereinafter, an exemplaryembodiment of the light emitting device 121 a will be described withreference to FIG. 3 .

As shown in FIG. 3 , the light emitting device 121 a may have astructure in which a substrate 1211, an N-type semiconductor layer 1212,an active layer 1213, and a P-type semiconductor layer 1214 aresequentially stacked.

The substrate 1211 may be formed of a transparent material such assapphire, and also formed of zinc oxide (ZnO), gallium nitride (GaN),silicon carbide (SiC), and aluminum nitride (AlN) in addition tosapphire.

In some exemplary embodiments, a buffer layer may be formed between thesubstrate 1211 and the N-type semiconductor layer 1212. The buffer layeris for improving lattice matching before growing the N-typesemiconductor layer 1212 on the substrate 1211, and may be omittedaccording to process conditions and device characteristics.

The N-type semiconductor layer 1212 may be formed of a semiconductormaterial which has a compositional formula of InXAlYGa (1−X−Y) N (here,0≤X, 0≤Y, and X+Y≤1). In more detail, the N-type semiconductor layer1212 may be formed with a GaN layer or a GaN/AlGaN layer doped withN-type conductive impurities, and for example, silicon (Si), germanium(Ge), tin (Sn), or the like may be used as the N-type conductiveimpurities.

The N-type semiconductor layer 1212 may be classified as a first layer1212 a and a second layer 1212 b. The first layer 1212 a may define alight emitting face, and the first layer 1212 a is formed to have anarea larger than the second layer 1212 b, and an optical characteristicof the light emitting device 121 a may be improved. On the second layer1212 b, an active layer 1213 and the P-type semiconductor layer 1214 maybe sequentially stacked to form a light emitting structure.

The active layer 1213 may be formed with an InGaN/GaN layer having amulti-quantum well structure.

The P-type semiconductor layer 1214 may be formed of a semiconductormaterial which has a compositional formula of InXAlYGa (1−X−Y) N (here,0≤X, 0≤Y, and X+Y≤1). In more detail, the P-type semiconductor layer1214 may be formed with a GaN layer or a GaN/AlGaN layer doped withP-type conductive impurities, and for example, magnesium (Mg), zinc(Zn), beryllium (Be), or the like may be used as the P-type conductiveimpurities.

An N-type electrode 1215 is formed on the N-type semiconductor layer1212, and a P-type electrode 1216 is formed on the P-type semiconductorlayer 1214.

An adhesive layer 1217 may have a structure in which metal layersrespectively formed of a single element are stacked as a multilayer, andinclude a reflective material to prevent that the reflectivity of a leadframe affects the characteristics of the light emitting devices 121 a.For example, the adhesive layer 1217 may be formed of a metal containingtin (Sn) or silver (Ag).

The lead frame is formed on the bottom of the body 121 b to supply apower source from the light emitting device 121 a. In addition, the leadframe may include a reflective material or be coated with a reflectivematerial which may reflect light generated by the light emitting device121 a.

The lead frame includes a first lead frame and a second lead frame. Thefirst lead frame and the second lead frame have an interval of a certaindistance, and the first lead frame is electrically connected to theN-type electrode 1215 and the second lead frame is electricallyconnected to the P-type electrode 1216.

When power is applied to the above-described light emitting devicepackage 121, electrons and holes flow from the N-type semiconductorlayer 1212 and the P-type semiconductor layer 1214 into the active layer1213, and a monochromatic light is generated by recombination of theelectrons and holes flowing into the active layer 1213.

A color of the monochromatic light generated by the light emittingdevice package 121 may be determined by a component of the semiconductordescribed above. For example, when a GaN based semiconductor is used,the light emitting device 121 a generates blue light.

Meanwhile, FIG. 3 is a simple view for describing one exemplaryembodiment of the light emitting device package 121, but the structureof the light emitting device package 121 is not limited thereto. Forexample, in some exemplary embodiments, the light emitting device 121 amay have a structure in which the P-type semiconductor layer 1214 isdisposed on an upper part thereof and the N-type semiconductor layer1212 is disposed on a lower part thereof.

Referring again to FIG. 2 , the body 121 b accommodates the lightemitting device 121 a. The body 121 b may be formed of at least one fromamong a resin based material such as polyphthalamide (PPA), silicon(Si), aluminum (Al), aluminum nitride (AlN), a liquid crystal polymer(PSG, photo sensitive glass), a polyamide9T (PA9T), a syndiotacticpolystyrene (SPS), a metal material, sapphire (Al2O3), beryllium oxide(BeO), and a printed circuit board (PCB) 110, but it is not limitedthereto.

The body 121 b may be formed by an injection molding process, an etchingprocess, or the like but is not limited thereto. For example, the body121 b may be integrally formed with the circuit board 110 by aninjection molding process.

In addition, the body 121 b includes a cavity 123 which accommodates thelight emitting device 121 a described above. A width and a height of thecavity 123 may be larger than those of the light emitting device 121 a,but those are not limited thereto.

The cavity 123 may be formed in a shape in which the width of the cavity123 decreases in a downward direction. That is, a sidewall 124 of thecavity 123 may be formed to be sloped. Here, a reflection angle of themonochromatic light emitted by the light emitting device 121 a variesaccording to an angle of the sidewall 124. Therefore, the degree ofslope of the sidewall 124 may be adjusted to adjust a beam angle of themonochromatic light.

Specifically, when the degree of slope of the sidewall 124 is decreased,a beam angle of the light is decreased and convergence of light emittedinto the outside from the light emitting device 121 a is increased. Onthe contrary, when the degree of slope of the sidewall 124 is increased,the beam angle of light is increased and convergence of light emittedinto the outside from the light emitting device 121 a is decreased.

In addition, a reflective material which reflects light generated by thelight emitting device 121 a may be coated on the sidewall 124 and a userate of light generated by the light emitting device 121 a may beincreased.

In some exemplary embodiments, the cavity 123 is molded with a materialwhich has excellent or otherwise desirable water tightness, corrosionresistance, and electric insulation, and may encapsulate the lightemitting device 121 a mounted inside the cavity 123. For example, thecavity 123 may be molded with an epoxy resin or silicon resin, or thelike, and the molding process may be performed by an ultraviolet raymethod or a heat curing method.

The lens 122 is provided outside of the light emitting device package121, and guides the monochromatic light generated by the emitting devicepackage 121. The lens 122 emits the monochromatic light generated by thelight emitting device package 121 in a direction of a light converter130.

The lens 122 may have a wide beam angle of light. The monochromaticlight emitted by the light emitting device package 121 may be widenedthrough the lens 122. Therefore, when the beam angle of light iswidened, because the light source 120 and the light converter 130 may beprovided adjacently, a thickness of the white light emitting device 100may become small.

In addition, when the beam angle of light is widened, because themonochromatic light emitted by the plurality of light emitting devicepackages 121 is uniformly incident to the light converter 130, thebrightness uniformity of the white light emitting device 100 may beincreased.

As shown in FIGS. 1 to 3 , the lens 122 may be formed in a hemisphericalshape, but the shape of the lens 122 is not limited thereto.

For example, the shape of the lens 122 may be one selected from among asquare pillar such as a regular hexahedron, a cylindrical type, anelliptical type, a bat-wing type having a concave center. However, thehemispherical shape can have excellent or desirable incident efficiencyinto a light converting layer.

Meanwhile, although the light sources 120 arranged in a rectangularshape is shown in FIG. 1 , the arrangement of the light sources 120 isnot limited thereto. That is, the plurality of light sources 120 may bearranged in various shapes to reduce the deviation of brightness andcolors, and to improve in the output uniformity of white light. Forexample, the light sources 120 may be arranged in a hexagonal shape.

FIG. 4 is a cross-sectional view of a white light emitting device 100 inaccordance with one exemplary embodiment.

Referring to FIGS. 1 and 4 , the light converter 130 converts anincident monochromatic light to white light and guides the white lightto the front thereof. To this end, the light converter 130 may include aphosphor which converts a wavelength of the incident monochromatic lightto a monochromatic light of different color to be transferred.

For example, although the phosphor may include at least one of a varietyof light emitting material among a yttrium aluminum garnet (YAG) basedmaterial, a terbium aluminum garnet (TAG) based material, a silicatebased material, a sulfide based material, a nitride based material, aborate based material, and a phosphate based material, the lightemitting material configuring the phosphor is not limited thereto.

The light emitting material configuring the phosphor may be determinedaccording to a monochromatic light incident from the light source 120.That is, the light converter 130 may include a phosphor emitting lighthaving a complementary color of the monochromatic light emitted from thelight source 120.

For example, when the light source 120 emits blue light, the lightconverter 130 may include a yellow light emitting phosphor having acomplementary color of a blue color. The yellow light emitting phosphorincludes a YAG based light emitting material, absorbs incident bluelight, and emits yellow light. Then, blue light not involved in lightemitting of the yellow color phosphor and yellow light emitted by theyellow color phosphor are mixed to become white light.

In some exemplary embodiments, when the light source 120 emits redlight, the light converter 130 may include a cyan light emittingphosphor having a complementary color of the red color, and when thelight source 120 emits green light, the light converter 130 may includea magenta light emitting phosphor having a complementary color of thegreen color.

Meanwhile, the light converter 130 may convert a monochromatic light towhite light using a plurality of phosphors. As described above, thelight converter 130 converts the monochromatic light to white lightbased on a principle of mixing light. For example, white light may alsobe generated by mixing blue light, red light, and green light.

Therefore, the light converter 130 may include a plurality of phosphorswhich emit different colors from each other. That is, the lightconverter 130 may generate complementary color light having acomplementary color of the monochromatic light emitted by the lightsource 120 using the plurality of phosphors.

For example, when the monochromatic light emitted by the light source120 is blue, the light converter 130 may include a green light emittingphosphor and red light emitting phosphor. The red light emittingphosphor absorbs incident blue light and emits red light, and the greenlight emitting phosphor absorbs blue light and emits green light.

Accordingly, blue light not involved in light emitting of phosphor,green light emitted by the green light emitting phosphor, and red lightemitted by red light emitting phosphor may be mixed to become whitelight. Here, the green light emitting phosphor and red light emittingphosphor may be formed on different layers.

A green light emitting phosphor may include at least one selected from agroup of a nitride based phosphor, a sulfide based phosphor, a silicatebased phosphor, and a quantum dot based phosphor.

A red light emitting phosphor may include at least one selected from agroup of a nitride based phosphor, a sulfide based phosphor, afluorinated based phosphor, and a quantum dot based phosphor.

A compensator 140 improves the color uniformity of a white lightemitting device 100. A color mura occurs in the white light emittingdevice 100 by refraction, reflection, and diffraction of themonochromatic light generated from the white light emitting device 100.Color mura can be, for example, an unevenness or non-uniformity in thewhite light produced by the white light emitting device 100. Thecompensator 140 is located between a circuit board 110 and a lightconverter 130, and may convert a monochromatic light, which isrefracted, reflected, and diffracted, to white light to compensate thecolor mura.

Specifically, as shown in FIG. 4 , the monochromatic light generated bya light emitting device package 121 is emitted onto a light converter130 through a lens 122. However, part of the monochromatic lightgenerated by the light emitting device package 121 may be scattered,reflected, diffracted, and recycled in the white light emitting device100, and is incident to the light converter 130. For example, amonochromatic light refracted by the lens 122 is reflected by asubstrate and is incident to the light converter 130.

A color mura occurs in the white light emitting device 100 by adifference between incident paths of the monochromatic light.Specifically, a comparatively great amount of blue light is incident toa part P1 of the light converter 130 adjacent to the light source 120,and a bluish color of white light WL is emitted therefrom. However, acomparatively great amount of blue light having a different path isincident to a part P2 of the light converter 130 between the lightsource 120 and another light source 120, and a yellowish color of whitelight WL is emitted therefrom.

Therefore, the compensator 140 converts part of light incident to thelight converter 130 through a different light path to white light toreduce the color mura. The compensator 140 may include at least onephosphor member 141 which converts an incident monochromatic light towhite light.

The phosphor member 141 may include a phosphor which converts awavelength of the incident monochromatic light to emit a different colorof the monochromatic light. The phosphor included in the phosphor member141 may include various kinds of phosphors described above, and convertan incident monochromatic light to different wavelength light to emitthe light.

Here, a light emitting material configuring a phosphor may be determinedaccording to an incident monochromatic light ML from the light source120. That is, the phosphor member 141 may include a phosphor which emitsa complementary color of a monochromatic light ML emitted by the lightsource 120.

Because the same monochromatic light ML is incident to the compensator140 and the light converter 130, a phosphor of the phosphor member 141and a phosphor of the light converter 130 may be the same, but it is notlimited thereto.

For example, because the phosphor member 141 may include a yellow lightemitting phosphor, incident blue light is converted to white light, andbecause the light converter 130 may include a red light emittingphosphor and green light emitting phosphor, incident blue light isconverted to white light.

On the contrary, because the light converter 130 may include a yellowlight emitting phosphor, incident blue light is converted to whitelight, and because the phosphor member 141 may include a red lightemitting phosphor and green light emitting phosphor, incident blue lightis converted to white light.

Thus, the compensator 140 may convert part of the monochromatic lightML, which is scattered or reflected and is incident to light converter130, to white light to improve the color uniformity of the white lightemitting device 100.

While the disposition of the compensator 140 has no limitation, as shownin FIG. 4 , in some exemplary embodiments the compensator 140 may beprovided adjacent the circuit board 110, and convert monochromatic lightML reflected by the circuit board 110 to white light.

Here, as shown in FIG. 1 , the compensator 140 may be provided in ashape of a compensation sheet or compensation film including thephosphor member 141, and formed by bonding the compensation sheet or thecompensation film to the circuit board 110. But, a method of forming thecompensator 40 is not limited thereto.

In another exemplary embodiment, as shown in FIG. 23 , a compensator 140may be directly formed on a circuit board 110. Specifically, thecompensator 140 may be formed by a method of coating phosphor members141 in a regular pattern onto the circuit board 110, or a method ofdepositing phosphor members 141 in a regular pattern on the circuitboard 110.

In addition, the compensator 140 may be also formed by a method ofdirectly printing phosphor members 141 on the circuit board 110.Specifically, the compensator 140 may be formed by a method of mixing aphosphor with an adhesive configured to fix the phosphor to the circuitboard 110 in order to form a phosphor ink, and directly printing thephosphor ink formed on the circuit board 110 in order to form thephosphor members 141. Here, the phosphor members 141 may also be formedin a regular pattern. A pattern of the phosphor members 141 will bedescribed in detail below.

FIG. 5 is a cross-sectional view of a white light emitting device 100 inaccordance with another exemplary embodiment.

Referring to FIG. 5 , a white light emitting device 100 may furtherinclude a reflector 150. The reflector 150 may be stacked on a circuitboard 110. The reflector 150 may reflect a monochromatic light emittedby a light source 120 toward a light converter 130 to increase theutilization rate of monochromatic light.

The reflector 150 may be formed with a reflective member which has agood elastic force and excellent light reflectivity and which is easy toform in a thin film. For example, the reflector 150 may be formed ofreflective material such as a polyethylene terephthalate (PET) of awhite color, a polycarbonate (PC), or the like of a white color.

Although the reflector 150 may be provided in a reflective sheet orreflective film shape and be coupled to the circuit board 110 by bondingto the circuit board 110 on which a compensator 140 is provided, amethod of forming the reflector 150 is not limited thereto.

For example, the reflector 150 may be formed by a method of depositing areflective member on the circuit board 110 on which the compensator 140is provided, or printing or coating the reflective member mixed with theadhesive onto the circuit board 110 on which the compensator 140 isprovided by mixing a reflective member with an adhesive.

FIG. 6 is a cross-sectional view of a white light emitting device 100 inaccordance with still another exemplary embodiment.

Referring to FIG. 6 , a white light emitting device 100 in accordancewith still another exemplary embodiment may include a circuit board 110,a plurality of light sources 120 which are mounted on the circuit board110 and each emit a monochromatic light, a light converter 130 whichconverts the monochromatic light ML to white light, a reflective sheetprovided on the circuit board 110, and a compensator 140 provided on thereflective sheet.

Although the compensator 140 is provided under the reflector 150 inFIGS. 4 and 5 , as shown in FIG. 6 , the circuit board 110, a reflector150, the compensator 140 may be stacked sequentially. In other exemplaryembodiments, the circuit board 110, a reflector 150, the compensator 140may be stacked in any desired order. When the stacking sequence of thewhite light emitting device 100 is changed, a method of fabricating thewhite light emitting device 100 may also be changed.

As described above, the reflector 150 is provided in a shape of areflective sheet or reflective film, and the compensator 140 is providedin a shape of a compensation sheet or compensation film, and the sheetor the film may be stacked sequentially to form a lower part of thewhite light emitting device 100. However, the method of forming thelower part of the white light emitting device 100 is not limitedthereto.

As another exemplary embodiment, a compensator 140 is formed on areflective sheet or reflective film, and the reflective sheet or thereflective film may be coupled to a circuit board 110 to form a lowerpart of a white light emitting device 100.

Specifically, the compensator 140 may be formed by a method of coatingphosphor members 141 in a regular pattern onto the reflective sheet orthe reflective film, or a method of depositing the phosphor members 141in a regular pattern on the reflective sheet or the reflective film.

In addition, the compensator 140 may also be formed by a method ofdirectly printing the phosphor members 141 onto the reflective sheet orthe reflective film. The compensator 140 may be formed by a method ofmixing a phosphor with an adhesive configured to fix the phosphor to thereflective sheet or the reflective film in order to form a phosphor ink,and directly printing the phosphor ink formed onto the reflective sheetor the reflective film in order to form the phosphor members 141. Here,the phosphor members 141 may be formed in a regular pattern.

Hereinafter, shapes of phosphor members 141 and an arrangement patternof phosphor members 141 may be described in detail.

FIG. 7 is a view for describing one exemplary embodiment of anarrangement pattern of phosphor members according to one exemplaryembodiment. FIG. 8 is a view for describing an arrangement pattern ofphosphor members according to another exemplary embodiment. FIG. 9 is aview for describing an arrangement pattern of phosphor members accordingto still another exemplary embodiment. FIG. 10 is a view for describingan arrangement pattern of phosphor members according to yet anotherexemplary embodiment.

Referring to FIGS. 7 to 10 , phosphor members 141 may be formed invarious shapes. For example, phosphor members 141 may be provided in arectangular shape as shown in FIG. 7 , or in a diamond shape as shown inFIG. 8 . In addition, phosphor members 141 may be provided in a circularshape as shown in FIG. 9 , or in an ellipsoidal shape as shown in FIG.10 . That is, the phosphor members 141 may be formed in an appropriateshape to reduce a color mura.

In addition, the phosphor members 141 may be arranged in a regularpattern. An arrangement pattern of the phosphor members 141 may bedifferent according to a pattern of the color mura.

That is, the phosphor members 141 may be arranged in a pattern accordingto the color mura. Here, a pattern of the color mura may be differentaccording to an arrangement of a light source 120, a shape of a lens122, and a kind of a light emitting device package 121.

In addition, an area of the phosphor member 141 per unit light sourcemay be determined according to a level of the color mura. When the areaof the phosphor member 141 is excessively large, the color mura isexcessively compensated and color uniformity is degraded, and when thearea of the phosphor member 141 is excessively small, the color mura isinsufficiently compensated and color uniformity is degraded. Therefore,the area of the phosphor member 141 may be determined according to thelevel of the color mura.

Specifically, the area of the phosphor member 141 per unit light sourcemay be determined according to a size of the phosphor member 141 and thenumber of phosphor members 141. That is, when n phosphor members 141having a size A per the light source 120 are disposed, the area of thephosphor members 141 per the light source is A*n.

Therefore, the size A of the phosphor member 141 may be adjustedaccording to the level of the color mura, or the number of the phosphormembers 141 disposed around a light source may be adjusted to determinea compensation level of the color mura.

As one exemplary embodiment of an arrangement pattern of phosphormembers 141, the phosphor members 141 may be arranged in a regularpattern included in a space between a light source 120 and another lightsource 120. Specifically, as shown in FIGS. 7 to 10 , the plurality ofphosphor members 141 may be provided at a predetermined distance (D)from the light source 120, and each phosphor member 141 may be arrangedto have an interval having a predetermined angle (θ) around the lightsource 120.

Here, distances between the light source 120 and the phosphor members141 may be determined according to distances between the plurality oflight sources 120. For example, the distance between the light source120 and the phosphor member 141 may be determined in proportion to adistance between the light source 120 and the light source 120.

Meanwhile although the plurality of phosphor members 141 are arranged ina circular shape in FIGS. 7 to 10 , the arrangement of the phosphormembers 141 may be different according to a shape of a light source 120,and particularly a shape of a lens 122. For example, when the lightsource 120 includes the lens 122 which has a rectangular shape, thephosphor members 141 may be arranged in a rectangular shape.

In addition, in FIGS. 7 to 10 , while phosphor members 141 are radiallyarranged around a light source 120, the arrangement pattern of thephosphor members 141 is not limited thereto.

FIG. 11 is a view for describing an arrangement pattern of phosphormembers 141 according to yet another exemplary embodiment. FIG. 12 is aview for describing a pattern of a color mura of a white light emittingdevice 100 in accordance with one exemplary embodiment.

An arrangement pattern of the plurality of phosphor members 141 may bedetermined according to a generation pattern of a color mura. As shownin FIG. 1 , when light sources 120 are arranged in a lattice pattern,the color mura may also be shown in a lattice pattern as shown in FIG.12 .

Therefore, the arrangement pattern of the phosphor members 141 may alsobe a lattice pattern as shown in FIG. 11 . Specifically, the pluralityof phosphor members 141 are arranged in a predetermined distance and ina lattice pattern to make groups 1141, 1142, 1143, and 1144, and each ofthe groups 1141, 1142, 1143, and 1144 may be vertically and laterallyarranged around the light source 120.

Here, the number of the phosphor members 141 and the size of eachphosphor member 141 configuring each of the groups 1141, 1142, 1143, and1144 may be determined according to a level of a color mura as describedabove.

Meanwhile, as shown in FIG. 12 , because a color mura comparativelyoccurs more in the edge of the white light emitting device 100 comparedto the center of the white light emitting device 100, the arrangementpattern of the phosphor members 141 on the edge of the white lightemitting device 100 may be different from the other portions.

As described above, because a correction of the color mura isproportional to the area of the phosphor members 141 per unit lightsource 120, a pattern of the phosphor members 141 may be adjusted sothat the area of the phosphor members per unit light source of the edgewhere the color mura is severe becomes large. This will be described inmore detail below with reference to FIGS. 13 to 14 .

FIG. 13 is a view for describing an arrangement pattern of phosphormembers on an edge of the white light emitting device 100 in accordancewith one exemplary embodiment.

As shown in FIG. 13 , phosphor members 141 a corresponding to a lightsource 120 a located on an edge of a white light emitting device 100 andphosphor members 141 b corresponding to a light source 120 b located ona center of the white light emitting device 100 have different sizes.

That is, the size of the phosphor member 141 a corresponding to thelight source 120 a located on the edge may be greater than that of thephosphor member 141 b corresponding to the light source 120 b located onthe center so that a color mura is further compensated on the edge wherethe color mura is comparatively severely generated.

Meanwhile, because the area of phosphor members per light source isinfluenced by the number of the phosphor members, the number of thephosphor members 141 a corresponding to the light source 120 a locatedon the edge may be greater than that of the phosphor members 141 bcorresponding to the light source 120 b located on the center.

FIG. 14 is a view for describing an arrangement pattern of phosphormembers on an edge of the white light emitting device 100 in accordancewith another exemplary embodiment.

Referring to FIG. 14 , phosphor members 141 c corresponding to a lightsource 120 c located on an edge of a white light emitting device 100 andphosphor members 141 d corresponding to a light source 120 d located ona center of the white light emitting device 100 may have differentshapes.

The phosphor members 141 d corresponding to the light source 120 dlocated on the center of the white light emitting device 100 may be acircular shape, and the phosphor members 141 c corresponding to a lightsource 120 c located on the edge may be polygonal shape so that a colormura is further compensated on the edge where the color mura iscomparatively severely generated.

Meanwhile although the phosphor members 141 are located between thelight source 120 and another light source 120 in FIGS. 1 to 14 , thedispositions of the phosphor members 141 are not limited thereto.Hereinafter, arrangement positions of the phosphor members 141 will bedescribed.

FIG. 15 is a cross-sectional view for describing an arrangement positionchange of phosphor members of a white light emitting device inaccordance with one exemplary embodiment. FIG. 16 is a cross-sectionalview for describing an arrangement position change of phosphor membersof a white light emitting device in accordance with another exemplaryembodiment. FIG. 17 is a cross-sectional view for describing anarrangement position change of phosphor members of a white lightemitting device in accordance with still another exemplary embodiment.

Referring to FIGS. 15 to 17 , phosphor members 145 provided inside alight source 120 may convert a monochromatic light refracted andreflected inside of the light source 120 to white light. Here, thephosphor members 145 may be disposed between a light emitting devicepackage 121 and a lens 122.

More specifically, as shown in FIGS. 15 to 17 , the phosphor members 145may be provided on a space where the lens 122 and the light emittingdevice package 121 are not seated. Here, the phosphor members 145provided inside the light source 120 may be arranged in a regularpattern.

FIG. 18 is a plan view of a light source for describing an arrangementpattern of phosphor members according to yet another exemplaryembodiment. FIG. 19 is a plan view of a light source for describing anarrangement pattern of phosphor members according to yet anotherexemplary embodiment. FIG. 20 is a plan view of a light source fordescribing an arrangement pattern of phosphor members according to yetanother exemplary embodiment.

Referring to FIGS. 2 and 18 to 20 , a light emitting device package 121is provided inside a lens 122. The lens 122 may be fixed on a circuitboard 110 by a supporter 127 disposed in an angle of 120 degrees.

Phosphor members 145 are provided in a space between the lens 122 andthe light emitting device package 121. As shown in FIGS. 18 to 20 , thephosphor members 145 may be arranged in spaces between supporters 127.

As described above, because the compensation of a color mura isproportional to the area of the phosphor members 145 per unit lightsource 120, the area of the phosphor member 145 and the number of thephosphor members 145 existing inside the light source 120 may bedifferent according to the compensation of the color mura.

FIG. 21 is a view for describing an arrangement pattern of phosphormembers according to yet another exemplary embodiment.

As shown in FIG. 21 , a compensator may include first phosphor members141 provided between the light source 120 and another light source, andsecond phosphor members 145 existing inside the light source 120.

Shapes and sizes of the first phosphor member 141 and the secondphosphor member 145 may be determined according to a level of a colormura as described above. Here, the first phosphor members 141 and thesecond phosphor members 145 may have different shapes. For example, thefirst phosphor members 141 may be provided in a circular shape, and thesecond phosphor members 145 may be provided in a fan shape in which aninside thereof is cut. In addition, the first phosphor members 141 andthe second phosphor members 145 may have different sizes.

In addition, the first phosphor members 141 and the second phosphormembers 145 may also have different arrangement patterns. For example,the first phosphor members 141 may be disposed in an angle of 30 degreesand in a circular shape, the second phosphor members 145 may be disposedin an angle of 120 degrees.

FIG. 22 is an exploded perspective view of a display device inaccordance with one exemplary embodiment. FIG. 23 is an explodedperspective view of a display device in accordance with anotherexemplary embodiment.

Referring to FIGS. 22 and 23 , a display device 200 in accordance withone exemplary embodiment includes a frame 210, a liquid crystal panel220, an optical part 235, a diffusion plate 240, and a white lightemitting device 100.

The frame 210 accommodates the liquid crystal panel 220, the opticalpart 235, and the white light emitting device 100. The frame 210 mayhave a square frame shape, and may be formed of a plastic or reinforcedplastic.

A chassis which surrounds the frame 210 and supports a backlightassembly may be disposed under or on sides of the frame 210 to improvethe durability and the fire resistance of the frame 210.

The liquid crystal panel 220 may adjust an arrangement of a liquidcrystal layer which refracts white light incident from a white lightemitting unit in different patterns to generate an image to be displayedto a user. To this end, the liquid crystal panel 220 may further includea thin plate transistor substrate 221 and a color display substrate 222in which a liquid crystal layer is provided between the thin filmtransistor substrate 221 and the color display substrate 222.

The thin plate transistor substrate 221 and the color display substrate222 may be spaced a certain distance from each other. A color filter anda black mattress may be provided on the color display substrate 222. Adriver 223 configured to transmit a driving signal to the thin filmtransistor substrate 221 may be installed on the thin film transistorsubstrate 221. The driver 223 may include a first substrate 224, adriving chip 225 connected to the first substrate 224, a secondsubstrate 226 on which the driving chip 225 is installed. The secondsubstrate 226 in accordance with an exemplary embodiment may be aprinted circuit board or a flexible printed circuit board (FPCB) 110.

In addition to the liquid crystal panel 220 described above, variouspanels which may be considered by those skilled in the art may be oneexemplary embodiment of the liquid crystal panels 220.

As desired, in the liquid crystal panel 220, a touch panel whichincludes a polyester film, glass, and the like may be installed to sensea touch operation or a polaroid film may be further installed topolarize light transmitted to the outside through the liquid crystalpanel 220.

The optical part 235 is provided between the liquid crystal panel 220and the white light emitting device 100. The optical part 235 diffusesand collects white light guided by the diffusion plate 240 and transmitsthe white light to the liquid crystal panel 220.

The optical part 235 may include a diffusion sheet 233 and prism sheets231 and 232. The diffusion sheet 233 serves to diffuse light emitted bythe diffusion plate 240, and the prism sheets 231 and 232 serve tocollect the light diffused by the diffusion sheet 233 to supply theuniform light to the liquid crystal panel 220.

The diffusion sheet 233 diffuses and outputs incident light. Furtheruniform white light may be provided to the liquid crystal panel 220 bythe diffusion sheet 233. The diffusion sheet 233 may be omitted orconfigured with a plurality of sheets as desired.

The prism sheets 231 and 232 may include a first prism sheet 231 and asecond prism sheet 232 in which prisms vertically intersect in x and yaxes directions. When the prism sheets 231 and 232 refract light from xand y axes directions, the linearity of the light may be improved.

The diffusion plate 240 diffuses and outputs white light emitted by thewhite light emitting device 100. That is, the white light emitted by thewhite light emitting device 100 is further diffused while passingthrough the diffusion plate 240. Therefore, the white light may bediffused to further improve brightness uniformity.

Specifically, the diffusion plate 240 may be provided in a plate shape.For example, the diffusion plate 240 may be implemented with atranslucent acrylic plate having a 1-2.5 mm thickness, and serve touniformly diffuse the white light emitted by the white light emittingdevice 100.

The white light emitting device 100 described above may be applied to adisplay device 200. The white light emitting device 100 may provide abacklight to the liquid crystal panel 220 described above.

Specifically, as described above, the white light emitting device 100may include a circuit board 110, a plurality of light sources 120, whicheach emit a monochromatic light ML, mounted on the circuit board 110, alight converter 130 converting the monochromatic light to white light,and a compensator 140 provided between the plurality of light sources120 in order to reduce a color mura.

The light sources 120 may be provided in a package type and theplurality of light sources 120 may be mounted on the circuit board 110.In FIGS. 22 and 23 , although the light sources 120 are arranged in alattice pattern, an arrangement pattern of the light sources may bechanged in various shapes as desired.

Here, the light source 120 generates and emits a monochromatic light.For example, the light source 120 may emit blue light generated by ablue LED. Here, blue light generated by a blue LED may be emitted in awide beam angle through the lens (122 of FIG. 2 ) described above.

A monochromatic light emitted by the light source 120 is converted towhite light while passing through the light converter 130. To this end,the light converter 130 may include a phosphor. For example, the lightconverter 130 may include a yellow light emitting phosphor having acomplementary color of blue light. In addition, the light converter 130may include a light phosphor and a green light emitting phosphor insteadof a yellow light emitting phosphor to generate white light.

White light transmitted by the light converter 130 reaches the liquidcrystal panel 220 passing through the diffusion plate 240 and theoptical part 235. Therefore, the liquid crystal panel 220 uses whitelight provided by the white light emitting device 100 as a backlight todisplay a predetermined image.

Here, the refraction, reflection, and diffraction of light may occurinside the display device 200 and the white light emitting device 100.Therefore, a color mura may occur in white light emitted by the whitelight emitting device 100 according to a change of a light path.

Thus, the compensator 140 may be located between the circuit board 110and the light converter 130, and convert a monochromatic light, which isrefracted, reflected, and rotated, to white light to compensate thecolor mura.

As described above, the compensator 140 may include phosphor members 141which may be arranged in various patterns of shapes. The phosphormembers 141 may include a phosphor. The phosphor members 141 convertpart of the monochromatic light incident to the compensator 140 tooutput the white light.

The phosphor included in the phosphor member 141 may be the same as thephosphor of the light converter 130 described above. For example, thephosphor members 141 may include a yellow light emitting phosphor havinga complementary color of blue light. In addition, the phosphor members141 may include a light phosphor and a green light emitting phosphorinstead of a yellow light emitting phosphor to generate white light.

As described above, the phosphor members 141 may be provided between thelight source 120 and the light source 120, but also provided inside thelight source 120. In addition, the phosphor members 141 may be providedboth inside and between the light sources 120.

In addition, an arrangement pattern of the phosphor members 141 may bedifferent according to a generation pattern of a color mura as describedabove.

In addition, because a level of the color mura may be more severe on anedge of a display part compared to a center of a display part, a patternof the phosphor members 141 of the edge of the display part and apattern of the phosphor members 141 of the center of the display partdisplay may be different from each other.

In addition, a shape and a size of the respective phosphor members 141may be determined according to the level of the color mura, and thecompensator 140 may include the plurality of phosphor members 141 havingdifferent shapes.

Here, as shown in FIG. 22 , the compensator 140 may be provided in acompensation sheet shape or a compensation film shape including thephosphor members 141, and be formed by bonding the compensation sheet orthe compensation film to the circuit board 110.

In addition, as shown in FIG. 23 a compensator 140 in accordance withanother exemplary embodiment may be directly formed on a circuit board110. Specifically, the compensator 140 may be formed by a method ofcoating phosphor members 141 in a regular pattern onto the circuit board110, or a method of depositing the phosphor members 141 in a regularpattern on the circuit board 110.

In addition, the compensator 140 may be formed by a method of directlyprinting the phosphor member 141 on the circuit board 110. Specifically,the compensator 140 may be formed by a method of mixing a phosphor withan adhesive configured to fix the phosphor to the circuit board 110 inorder to form a phosphor ink, and directly printing the phosphor inkformed on the circuit board 110 to form the phosphor members 141.

In addition, as shown in FIGS. 5 and 6 , a white light emitting device100 may further include a reflector 150. The reflector 150 may bestacked on a circuit board 110, and reflect light emitted by a lightsource 120 toward a light converter 130 to increase the utilization rateof the light source 120. Here, the reflector 150 may be provided in areflective sheet or reflective film type.

When the reflector 150 is provided in the reflective sheet or reflectivefilm type, a compensator 140 may be directly formed on a reflectivesheet or film.

Specifically, the compensator 140 may be formed by a method of coatingphosphor members 141 in a regular pattern onto the reflective sheet orthe reflective film, or a method of depositing the phosphor members 141in a regular pattern on the reflective sheet or the reflective film.

In addition, the compensator 140 may be formed by a method of directlyprinting the phosphor members 141 on the reflective sheet or thereflective film. The compensator 140 may be formed by a method of mixinga phosphor with an adhesive configured to fix the phosphor to thereflective sheet or the reflective film to form a phosphor ink, anddirectly printing the phosphor ink formed on the reflective sheet or thereflective film to form the phosphor members 141. Here, the phosphormembers 141 may be formed in a regular pattern.

Hereinafter, a white LED including a plurality of light source moduleswill be specifically described in accordance with accompanying drawings.The same numerals are generally assigned to components which are thesame as that of the exemplary embodiments described above, and aspecific description thereof will be omitted.

FIG. 24 is a schematic exploded perspective view of a white lightemitting device including a plurality of light source modules, FIG. 25is a schematic perspective view for describing a light source module,FIG. 26 is a cross-sectional view of a white light emitting device, andFIG. 27 is a cross-sectional view of a white light emitting device whichfurther includes a coated layer.

Referring to FIG. 24 , a white light emitting device includes a base, aplurality of light source modules 320 emitting a monochromatic light,and a light converter 130 converting the monochromatic light emittedfrom the plurality of light source modules 320 to white light.

The light source modules 320 are coupled on the base 310. The base 310may be formed of a plastic or a reinforced plastic, but it is notlimited thereto.

In addition, the base 310 may be omitted as desired, or be replaced witha different component. For example, the frame 210 illustrated in FIG. 22may become the base 310. That is, the plurality of light source modules320 may be coupled to the frame 210.

In addition, a reflective member is provided on a surface of the base310 to reflect a monochromatic light incident through the light sourcemodule 320 toward the light converter 130.

The light converter 130 converts a monochromatic light to white light.The light converter 130 is spaced a certain distance from the lightsource module 320, converts a monochromatic light emitted from the lightsource module 320 to white light, and emits the white light forward. Tothis end, the light converter 130 may include a phosphor which convertsa wavelength of an incident monochromatic light and emits amonochromatic light having a different color.

The plurality of light source modules 320 may be spaced a certaindistance D1 from each other. At this time, distances between the lightsource modules 320 may be the same, but the distances between the lightsource modules 320 may be different from each other when it is required.For example, a distance between a second light source module 320-2 and athird light source module 320-3 may be smaller than that of a firstlight source module 320-1 and the second light source module 320-2, butit is not limited thereto.

Referring to FIGS. 25 and 26 , the light source module 320_1 includes acircuit board 110, compensators 140, and a plurality of light sources120.

The plurality of light sources 120 are mounted on the circuit board 110.The circuit board 110 may be provided in a long bar shape.

The length L of the circuit board 110 may be determined to correspond tothe length of the white light emitting device 300, the width W1 of thecircuit board 110 may be determined to correspond to the width of thelight source 120. Specifically, as illustrated in FIG. 25 , the width W1of the circuit board 110 may be greater than the width W2 of the lightsource 120, but is not limited thereto, and may have a width in which alight emitting device package of the light source 120 may be mounted.

The plurality of light sources 120 are mounted on the circuit board 110with a certain interval, and emit a monochromatic light. The intervalsbetween the plurality of light sources 120 may be the same, but theplurality of light sources 120 may be also disposed with the intervalsdifferent from each other.

The compensator 140 is provided between the light converter 130 and thecircuit board 110 to improve the color uniformity of the white lightemitting device 300. Specifically, the compensator 140 converts anincident monochromatic light to white light and output the white lightto reduce a color mura of the white light emitting device 300.

The compensator 140 may include a plurality of phosphor members 141which convert an incident monochromatic light to white light and outputthe white light. At this time, the phosphor member 141 may include aphosphor which is formed of at least one phosphor material and convertsa wavelength of an incident monochromatic light. Phosphor materialforming the phosphor member 141 may be determined according to amonochromatic light incident from the light source 120.

The compensator 140 may be provided by a method of forming the pluralityof phosphor members 141 on the circuit board 110. Specifically, thecompensator 140 may be formed by a method of coating the phosphormembers 141 in a regular pattern on the circuit board 110, or a methodof depositing the phosphors members 141 in a regular pattern on thecircuit board 110.

In addition, the compensator 140 may be also formed by a method ofdirectly printing the phosphor member 141 on the circuit board 110.Specifically, the compensator 140 may be formed by a method of mixing aphosphor with an adhesive for fixing the phosphor to the circuit board110 to form a phosphor ink, and directly printing the formed phosphorink on the circuit board 110 to form the phosphor member 141.

The phosphor member 141 may be provided inside or outside the lightsource 120, but the position of the phosphor member 141 is not limitedthereto. For example, as described above, the phosphor member 141 may beformed inside the light source 120 or outside the light source 120 asdescribed above, or may be formed inside and outside the light source120.

The phosphor member 141 may be formed in a various shapes. For example,as illustrated in FIG. 25 , the phosphor member 141 may be formed in arectangular shape. At this time, the length of the phosphor member 141may correspond to the width D2 of the light source 120 or the width D1of the circuit board 110, but it is not limited thereto.

The plurality of phosphor members 141 may be formed to have a certainpattern. For example, as illustrated in FIG. 25 , the phosphor member141 may be formed to have a certain interval in a longitudinal directionof the light source module 320-1, but the pattern of the phosphor member141 is not limited thereto.

Meanwhile, as illustrated in FIG. 27 , the white light emitting device300 may further include a coated layer 330 which is transparent. Thecoated layer 330 may be stacked on the circuit board 110, in which thephosphor member 141 is formed, to prevent the phosphor member 141 andthe circuit board 110 from being damaged.

FIG. 28 is an exploded perspective view of a white light emitting devicewhich further includes a reflector, and FIG. 29 is a cross-sectionalview of a white light emitting device which further includes areflector.

Referring to FIGS. 28 and 29 , the white light emitting device 300including the plurality of light source modules 320 may further includea reflector 340.

The reflector 340 may be stacked on the plurality of light sourcemodules 320, and reflect light emitted from the light source 120 towardthe light converter 130 to increase a use rate of the light source 120.At this time, the reflector 340 may be provided in a reflective sheet ora reflective film type.

The reflector 340 may be provided by a method of stacking on the lightsource module 320 on which the light sources 120 are mounted. To thisend, the reflector 340 may include a plurality of openings formed tocorrespond to the plurality of light sources 120. The diameter of theopenings formed in the reflector 340 may be greater than that of thelight source 120.

As described above, because the reflector 340 is provided by a method ofstacking on the light source module 320 on which the light source 120 ismounted, the reparability of the light source 120 may be improved.

As is apparent from the above description, the color uniformity of awhite light emitting device can be improved by converting amonochromatic light, which is reflected and refracted inside of thewhite light emitting device, to white light.

In addition, a color mura can be effectively compensated by determiningan arrangement of phosphor members according to a pattern of the colormura of the white light emitting device.

Although a few exemplary embodiments have been shown and described, itwould be appreciated by those skilled in the art that changes may bemade in these exemplary embodiments without departing from the scope asdefined in the following claims and their equivalents.

What is claimed is:
 1. A light emitting device comprising: a boardincluding an edge; a plurality of light sources disposed on the board,each light source of the plurality of light sources including a lightemitting diode configured to emit blue light; a reflective sheetdisposed on the board; a light converter apart from the board; and aplurality of phosphor members provided on the reflective sheet, whereinthe plurality of light sources comprises a first light source disposedat a first distance from the edge of the board and a second light sourcedisposed at a second distance from the edge of the board, the seconddistance being greater than the first distance, wherein the plurality ofphosphor members comprises a plurality of first phosphor membersprovided on the reflective sheet to surround the first light source anda plurality of second phosphor members provided on the reflective sheetto surround the second light source, wherein a size of each of theplurality of first phosphor members is greater than a size of each ofthe plurality of second phosphor members, and wherein a number of theplurality of first phosphor members is greater than a number of theplurality of second phosphor members.
 2. The light emitting deviceaccording to claim 1, wherein the plurality of first phosphor membersare arranged substantially equiangular around the first light source,and the plurality of second phosphor members is arranged substantiallyequiangular around the second light source.
 3. The light emitting deviceaccording to claim 1, wherein the plurality of first phosphor membersare arranged substantially equidistant from each other around the firstlight source, and the plurality of second phosphor members are arrangedsubstantially equidistant from each other around the second lightsource.
 4. The light emitting device according to claim 1, wherein theplurality of first phosphor members are arranged substantiallyequidistant from the first light source, and the plurality of secondphosphor members are arranged substantially equidistant from the secondlight source.
 5. The light emitting device according to claim 1, whereinthe plurality of first phosphor members are arranged at intervals on acircumference of a first circle surrounding the first light source, andthe plurality of second phosphor members are arranged at intervals on acircumference of a second circle surrounding the second light source. 6.A display apparatus, comprising: a display panel; and a light emittingdevice configured to emit light on the display panel, wherein the lightemitting device comprises: a board including an edge; a plurality oflight sources disposed on the board, each light source of the pluralityof light sources including a light emitting diode configured to emitblue light; a reflective sheet disposed on the board; a light converterapart from the board; and a plurality of phosphor members provided onthe reflective sheet, and wherein the plurality of light sourcescomprises a first light source disposed at a first distance from theedge of the board and a second light source disposed at a seconddistance from the edge of the board, the second distance being greaterthan the first distance, wherein the plurality of phosphor memberscomprises a plurality of first phosphor members provided on thereflective sheet to surround the first light source and a plurality ofsecond phosphor members provided on the reflective sheet to surround thesecond light source, wherein a size of each of the plurality of firstphosphor members is greater than a size of each of the plurality ofsecond phosphor members, and wherein a number of the plurality of firstphosphor members is greater than a number of the plurality of secondphosphor members.
 7. The display apparatus according to claim 6, whereinthe plurality of first phosphor members are arranged substantiallyequiangular around the first light source, and the plurality of secondphosphor members is arranged substantially equiangular around the secondlight source.
 8. The display apparatus according to claim 6, wherein theplurality of first phosphor members are arranged substantiallyequidistant from each other around the first light source, and theplurality of second phosphor members are arranged substantiallyequidistant from each other around the second light source.
 9. Thedisplay apparatus according to claim 6, wherein the plurality of firstphosphor members are arranged substantially equidistant from the firstlight source, and the plurality of second phosphor members are arrangedsubstantially equidistant from the second light source.
 10. The displayapparatus according to claim 6, wherein the plurality of first phosphormembers are arranged at intervals on a circumference of a first circlesurrounding the first light source, and the plurality of second phosphormembers are arranged at intervals on a circumference of a second circlesurrounding the second light source.